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Transients on Overhead Lines

Authored by: Akihiro Ametani , Naoto Nagaoka , Yoshihiro Baba , Teruo Ohno , Koichi Yamabuki

Power System Transients

Print publication date:  November  2016
Online publication date:  November  2016

Print ISBN: 9781498782371
eBook ISBN: 9781315366791
Adobe ISBN:

10.1201/9781315366791-3

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Abstract

There are various kinds of transients in a power system. In general, over-voltages caused by transients are important in a power system because of its insulation against overvoltages. Table 2.1 summarizes overvoltages in a power system [1,2]. A temporary overvoltage is one caused by an abnormal system condition such as a line fault, and is evaluated by the steady-state solution of an abnormal system condition. Thus, temporary overvoltage is not considered a transient overvoltage. A typical example of temporary overvoltage caused by a line-to-ground fault is shown in Figure 2.1. Immediately after the initiation of the line-to-ground fault, a transient called “fault surge” occurs, but dies out in a few milliseconds. Then, a sustained dynamic overvoltage is observed. This is called the “temporary voltage.”

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